<template>
  <div class="subject">
    <span>{{num}}</span>
    <span>+</span>
    <span>{{num2}}</span>
    <span>=</span>
    <input type="number" v-model.number="sum" />
    <button @click="btn" :disabled="abc">提交</button>
  </div>
</template>

<script>
export default {
  name: "subject",
  props: ["idx"],
  data() {
    return {
      abc: false,
      aaa: 0,
      sum: null,
      num: Math.floor(Math.random() * 10),
      num2: Math.floor(Math.random() * 10),
    };
  },

  methods: {
    btn() {
      let numstr = this.num + this.num2 == this.sum ? "正确" : "错误";
      this.$emit("result", numstr, this.idx);
      this.abc = true;
    },
  },
};
</script>

<style scoped>
.subject {
  margin: 5px;
  padding: 5px;
  font-size: 20px;
}
.subject span {
  display: inline-block;
  text-align: center;
  width: 20px;
}
.subject input {
  width: 50px;
  height: 20px;
}
</style>